Study

Item 1

https://backpack.tf/item/7957307046

Sale 1

Excluding trades to and from tftrade.ru

Sale 2

https://backpack.tf/profiles/76561198272832232#!/compare/1607731200/1607817600

https://backpack.tf/profiles/76561199002037805#!/compare/1607731200/1607817600

Untrace

Sale 3

https://backpack.tf/profiles/76561199002037805#!/compare/1607731200/1607817600

https://backpack.tf/profiles/76561198216565523#!/compare/1607731200/1607817600

These match:

Aces High Big Country - https://backpack.tf/suggestion/60147355a3b78946dc1eca60 - 9.5 keys

Miami Nights Hetman's Headpiece - https://backpack.tf/suggestion/60147d870577ec4d45544107 - 9 keys

9 + 9.5 = 18.5 keys

Taking 19 keys

Sale 4

https://backpack.tf/profiles/76561198216565523#!/compare/1607731200/1607817600

https://backpack.tf/profiles/76561198188093413#!/compare/1607817600/1607904000

Untrace

Item 2

https://backpack.tf/item/4577372449

Sale 5

https://backpack.tf/profiles/76561198449168929#!/compare/1608508800/1608854400

https://backpack.tf/profiles/76561198841279602#!/compare/1608422400/1608508800

Untrace

Sale 6

https://backpack.tf/profiles/76561198841279602#!/compare/1609459200/1609545600

https://gladiator.tf/listings/5fefca7098b863f7b238f778 - buyout 20 keys

https://prnt.sc/xtskkt - sold for 20 keys

https://backpack.tf/item/9285819594 - key history for proof

Sales

19, 20

Current Listings

https://prnt.sc/xtyakz

Seller at 17 keys for 3 days

Buyers at 15.36 keys

Taking 19 - 20 keys I guess